From: Jon Masters <jcm@redhat.com>
To: Hanjun Guo <guohanjun@huawei.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Hanjun Guo <hanjun.guo@linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Olof Johansson <olof@lixom.net>,
Grant Likely <grant.likely@linaro.org>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
Arnd Bergmann <arnd@arndb.de>,
Mark Rutland <mark.rutland@arm.com>,
Graeme Gregory <graeme.gregory@linaro.org>,
Sudeep Holla <Sudeep.Holla@arm.com>,
Marc Zyngier <marc.zyngier@arm.com>,
Mark Brown <broonie@kernel.org>, Robert Richter <rric@kernel.org>,
Timur Tabi <timur@codeaurora.org>,
Ashwin Chaugule <ashwinc@codeaurora.org>,
suravee.suthikulpanit@amd.com, linux-acpi@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linaro-acpi@lists.linaro.org,
Tomasz Nowicki <tomasz.nowicki@linaro.org>,
Zhangdianfang <zhangdianfang@huawei.com>
Subject: Re: [update][PATCH v10 06/21] ACPI / sleep: Introduce CONFIG_ACPI_GENERIC_SLEEP
Date: Tue, 17 Mar 2015 01:59:30 -0400 [thread overview]
Message-ID: <5507C2C2.1090509@redhat.com> (raw)
In-Reply-To: <5507A91A.1090206@huawei.com>
On 03/17/2015 12:10 AM, Hanjun Guo wrote:
> On 2015/3/17 11:23, Rafael J. Wysocki wrote:
>> On Tuesday, March 17, 2015 10:36:47 AM Hanjun Guo wrote:
>> Well, almost. There is one problem with that, becuase sleep.c contains code
>> outside of the ACPI_SLEEP-dependent blocks. That code is used for powering
>> off ACPI platforms.
>>
>> I guess you don't want that code on ARM too, right?
>
> Yes, you are right.
>> Perhaps we can use ACPI_REDUCED_HARDWARE_ONLY for that? ARM64 will be the
>
> Sorry, I can't fully understand your intention here, could you please
> explain it more?
>
> Let me guess a little bit. Do you mean use ACPI_REDUCED_HARDWARE_ONLY for
> powering off ACPI platforms? if so, I guess it's not a good idea, ACPI spec
> only says that S4BIOS is not supported on HW-reduced ACPI platforms, S5
> has no such limitation, if I miss something here, please let me know.
If helpful to the discussion, current SBBR (Server Base Boot
Requirements[0]) design guidance is that for power off itself, we will
prefer calling an EFI Runtime Service (that will preferentially call an
PSCI - ARM Power State Coordination Interface - Secure Monitor Call (SMC
- think SMI-like) internally to perform the shutdown/reboot) for the
action of powering off or resetting 64-bit ARM SBBR platforms.
Therefore if the alternative of an ACPI-based power off solution were
not initially supported, I don't think it would have much practical
impact, and it could be addressed after the initial support merged.
That's just my $0.02.
Jon.
[0] The Server Base Boot Requirements are the platform specification we
created for 64-bit ARM servers. They mandate the use of EFI and ACPI in
compliant platforms:
http://infocenter.arm.com/help/topic/com.arm.doc.den0044a/Server_Base_Boot_Requirements.pdf
next prev parent reply other threads:[~2015-03-17 5:59 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-13 8:14 [update][PATCH v10 06/21] ACPI / sleep: Introduce CONFIG_ACPI_GENERIC_SLEEP Hanjun Guo
2015-03-13 21:49 ` Rafael J. Wysocki
2015-03-16 12:14 ` Hanjun Guo
2015-03-16 23:15 ` Rafael J. Wysocki
2015-03-17 1:08 ` Hanjun Guo
2015-03-17 2:28 ` Rafael J. Wysocki
2015-03-17 2:36 ` Hanjun Guo
2015-03-17 3:23 ` Rafael J. Wysocki
2015-03-17 4:10 ` Hanjun Guo
2015-03-17 5:59 ` Jon Masters [this message]
2015-03-17 6:31 ` Hanjun Guo
2015-03-17 14:33 ` Rafael J. Wysocki
2015-03-18 1:56 ` Hanjun Guo
2015-03-17 12:35 ` Lorenzo Pieralisi
[not found] ` <CAGHbJ3DhUB688K7ooT7ai=2QjRp7S+_E_Y+a+GupeTvjR5omMg@mail.gmail.com>
2015-03-17 14:29 ` [PATCH] ACPI / sleep: Drop acpi_suspend() which is not used Rafael J. Wysocki
2015-03-17 14:24 ` Lorenzo Pieralisi
2015-03-18 1:17 ` Hanjun Guo
2015-03-17 14:30 ` [update][PATCH v10 06/21] ACPI / sleep: Introduce CONFIG_ACPI_GENERIC_SLEEP Rafael J. Wysocki
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